Increased risk was found for analogue phone use; OR = 3.75, 95 % CI = 0.97-14.43, and digital mobile phone use only; OR = 2.71, 95 % CI = 1.03-7.10. Risks were higher for temporal tumours, occupational and urban mobile phone use. Unfortunately the study did not include use of cordless phones (DECT) which leads to underestimate of the risks since such use was regarded as no exposure to radiofrequency electromagnetic fields (RF-EMF).

The study included also cases with meningioma. A statistically significant increased risk was found for cumulative duration of calls > 896 hours yielding OR = 2.57, 95 % CI = 1.02-6.44. However, overall the results were less consistent for an association than for gliomas.